diff --git a/ansible/roles/test/files/ptftests/dhcpv6_relay_test.py b/ansible/roles/test/files/ptftests/dhcpv6_relay_test.py
index 9fc96bfecc5..19c579954f7 100644
--- a/ansible/roles/test/files/ptftests/dhcpv6_relay_test.py
+++ b/ansible/roles/test/files/ptftests/dhcpv6_relay_test.py
@@ -230,6 +230,7 @@ def verify_relayed_solicit_relay_forward(self):
     def server_send_advertise_relay_reply(self):
         # Form and send DHCPv6 RELAY-REPLY encapsulating ADVERTISE packet
         advertise_relay_reply_packet = self.create_dhcp_advertise_relay_reply_packet()
+        advertise_relay_reply_packet.src = self.dataplane.get_mac(0, self.server_port_indices[0])
         testutils.send_packet(self, self.server_port_indices[0], advertise_relay_reply_packet)
 
     # Verify that the DHCPv6 ADVERTISE would be received by our simulated client
@@ -279,6 +280,7 @@ def verify_relayed_request_relay_forward(self):
     def server_send_reply_relay_reply(self):
         # Form and send DHCPv6 RELAY-REPLY encapsulating REPLY packet
         reply_relay_reply_packet = self.create_dhcp_reply_relay_reply_packet()
+        reply_relay_reply_packet.src = self.dataplane.get_mac(0, self.server_port_indices[0])
         testutils.send_packet(self, self.server_port_indices[0], reply_relay_reply_packet)
 
     # Verify that the DHCPv6 REPLY would be received by our simulated client